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Industrial Injection CP3 Pumps - 2004.5-05 Chevy/GMC LLY

In the ’01-to-’10 Duramax and ’03-to-present Cummins, the heart of the common-rail system has been the Bosch CP3. Unlike previous (pre-common-rail) injection pumps, it has fewer tasks to perform. The CP3 injection pump’s sole job is to create and regulate high-pressure fuel (it’s not timed with the engine’s crankshaft and camshaft). The fact that the CP3 came from Bosch’s heavy-duty line of injection pumps also speaks to its great reliability, as it was designed to play a vital role in million-mile engines.